The advert did state that upgrade was expected within 6 years on the document that I read from NetJets, however I do not know how the company can predict this, given the number of Command ready First Officers waiting for upgrade since more than ten years already. As Dirk and others say: don’t join NetJets expecting a quick upgrade, a decent salary, or a pension worthy of that name. They are offering 6 on, 5 off and that is the main incentive.
Bottom line:look around. Do not get tricked by the salary, look at the package value. That means looking at the TOTAL COST OF EMPLOYMENT, not the salary. NetJets is social phobic, this means that if they offer you 100€, the cost to NetJets is circa €115. If Lufthansa pays you 100€, the cost to them is closer to 200€, Check it out. You get what your employer pays for and it is important to look at this for you long term security (social protection, healthcare, unemployment cover, long term sickness and pension). NetJets offers a low salary, with a below minimum social protection package. If you join, then do so because you don’t care about social protection, want the 6/5 lifestyle and don’t need the money.